15280 + Interview Questions in Chemistry Page 55 InterviewSolution

2701.	what is meant by tenselity
Answer» what is meant by tenselity

Discussion

2702.	in a cons†an t volume calorimeter ,5g of a gas with molecular weight 40 was burnt in excess of oxygen at 298K.temp. of calorimeter rise from 298k to 298.75 K due to combustion process.given that heat capacity is 2.5kj/K. △ U of combustion of gas in KJ/mol is
Answer» in a cons†an t volume calorimeter ,5g of a gas with molecular weight 40 was burnt in excess of oxygen at 298K.temp. of calorimeter rise from 298k to 298.75 K due to combustion process.given that heat capacity is 2.5kj/K. △ U of combustion of gas in KJ/mol is

Discussion

2703.	Answer the following:(a) Why is plaster of Paris written as CaSO4.12H2O? How is it possible to have half a water molecule attached to CaSO4?(b) Why is sodium hydrogencarbonate an essential ingredient in antacids?(c) When electricity is passed through an aqueous solution of sodium chloride, three products are obtained. Why is the process called chlor-alkali?
Answer» Answer the following: (a) Why is plaster of Paris written as ${CaSO}_{4} . \frac{1}{2} H_{2} O$ ? How is it possible to have half a water molecule attached to CaSO₄? (b) Why is sodium hydrogencarbonate an essential ingredient in antacids? (c) When electricity is passed through an aqueous solution of sodium chloride, three products are obtained. Why is the process called chlor-alkali?

Discussion

2704.	Where is HCl used in the textile industry?
Answer» Where is HCl used in the textile industry?

Discussion

2705.	Name an alloy of: (a) aluminium used in aircraft construction. (b) lead used in electrical wiring or electrical work in joining metals. (c) copper in electrical appliances or household vessels. (d) zinc used in simple voltaic cells.
Answer» Name an alloy of: (a) aluminium used in aircraft construction. (b) lead used in electrical wiring or electrical work in joining metals. (c) copper in electrical appliances or household vessels. (d) zinc used in simple voltaic cells.

2705.

Name an alloy of: (a) aluminium used in aircraft construction. (b) lead used in electrical wiring or electrical work in joining metals. (c) copper in electrical appliances or household vessels. (d) zinc used in simple voltaic cells.

Answer»

Name an alloy of:

(a) aluminium used in aircraft construction.

(b) lead used in electrical wiring or electrical work in joining metals.

(c) copper in electrical appliances or household vessels.

(d) zinc used in simple voltaic cells.

Discussion

2706.	Why iron pyrites is not considered an ore?
Answer» Why iron pyrites is not considered an ore?

Discussion

2707.	What is known as the energy required to start a chemical reaction?
Answer» What is known as the energy required to start a chemical reaction?

Discussion

2708.	What is photo decomposition reaction
Answer» What is photo decomposition reaction

Discussion

2709.	The number of moles present in 155 g of phosphorous is
Answer» The number of moles present in 155 g of phosphorous is

Discussion

2710.	If pressure becomes double at the same absolute temperature on 2 L of CO2 , then what will be the final volume of CO2?
Answer» If pressure becomes double at the same absolute temperature on 2 L of ${CO}_{2}$ , then what will be the final volume of ${CO}_{2}$ ?

Discussion

2711.	What are biotic and abiotic factors?
Answer» What are biotic and abiotic factors?

Discussion

2712.	Write the equations for the reactions, which take place at the electrodes during the electrolysis of lead bromide.
Answer» Write the equations for the reactions, which take place at the electrodes during the electrolysis of lead bromide.

Discussion

2713.	87.The structure of XeF4 is square planer it could be bent as Co2 as in both cases there are 2 pairs of lone pair electron there was a possibility of lone pair electronto be in the same side in XeF4 Explain according to law of hybridization
Answer» 87.The structure of XeF4 is square planer it could be bent as Co2 as in both cases there are 2 pairs of lone pair electron there was a possibility of lone pair electronto be in the same side in XeF4 Explain according to law of hybridization

Discussion

2714.	How many electrons are lost by zinc during the process of oxidation?
Answer» How many electrons are lost by zinc during the process of oxidation?

Discussion

2715.	23. is doubledisplacement reaction reversible? And do the electronegative radicals have reactiviy series.
Answer» 23. is doubledisplacement reaction reversible? And do the electronegative radicals have reactiviy series.

Discussion

2716.	Give one example of an oxidation-reduction reaction which is also : (a) a combination reaction (b) a displacement reaction
Answer» Give one example of an oxidation-reduction reaction which is also : (a) a combination reaction (b) a displacement reaction

2716.

Give one example of an oxidation-reduction reaction which is also : (a) a combination reaction (b) a displacement reaction

Answer»

Give one example of an oxidation-reduction reaction which is also :

(a) a combination reaction

(b) a displacement reaction

Discussion

2717.	why interstitial compounds have high melting point than those of pure metals ?
Answer» why interstitial compounds have high melting point than those of pure metals ?

Discussion

2718.	Calculate pH of 0.01M solutions of NaOH
Answer» Calculate pH of 0.01M solutions of NaOH

Discussion

2719.	58. The number of electrons in Na (Z=11) having ( n+l=3) (1) 1 (2) 4 (3) 7 (4)
Answer» 58. The number of electrons in Na (Z=11) having ( n+l=3) (1) 1 (2) 4 (3) 7 (4)

Discussion

2720.	Sulphuric acid acts as the ___ in lead accumulators.
Answer» Sulphuric acid acts as the ___ in lead accumulators.

Discussion

2721.	Reaction of all metals with concentrated HNO3 gives NO2 +H2O + metal nitrate ?? Or there is some exceptions
Answer» Reaction of all metals with concentrated HNO3 gives NO2 +H2O + metal nitrate ?? Or there is some exceptions

Discussion

2722.	Give one example of a substance which contains: (i) ions only, (ii) molecules only, (iii) both ions and molecules.
Answer» Give one example of a substance which contains: (i) ions only, (ii) molecules only, (iii) both ions and molecules.

Discussion

2723.	On the basis of Quantum numbers justify that sixth period of the periodic table should have 32 elements?
Answer» On the basis of Quantum numbers justify that sixth period of the periodic table should have 32 elements?

Discussion

2724.	Explain the merits of modern periodic table?
Answer» Explain the merits of modern periodic table?

Discussion

2725.	the total no. of moles of CO2 formed on thermal decomposition of 4 moles of limesto
Answer» the total no. of moles of CO2 formed on thermal decomposition of 4 moles of limesto

Discussion

2726.	35. At 444 ^° C 15 mole of H2 and 5.2 mole of I2 react to form 10 mole of HI.calculate the equlibrium constant for the reaction
Answer» 35. At 444 ^° C 15 mole of H2 and 5.2 mole of I2 react to form 10 mole of HI.calculate the equlibrium constant for the reaction

Discussion

2727.	Which of the following molecule is called backminsterfullerene ? C90 C60 C70 C120
Answer» Which of the following molecule is called backminsterfullerene ? $C_{90} C_{60} C_{70} C_{120}$

Discussion

2728.	Explain briefly about representative elements ?
Answer» Explain briefly about representative elements ?

Discussion

2729.	How abnormal molecular mass is observed in case of non-ideal or dilute solutions
Answer» How abnormal molecular mass is observed in case of non-ideal or dilute solutions

Discussion

2730.	What happens to hydronium ion concentration while diluting an acid
Answer» What happens to hydronium ion concentration while diluting an acid

Discussion

2731.	In the following diagram for the first three periods of the periodic table, five elements have been represented by the letters a, b, c, d and e (which are not their chemical symbols):(i) Select the letter which represents a halogen.(ii) Select the letter which represents a noble gas.(iii) What type of bond is formed between a and b?(iv) What type of bond is formed between c and b?(v) Which element form a divalent anion?Give reasons for your choices.
Answer» In the following diagram for the first three periods of the periodic table, five elements have been represented by the letters a, b, c, d and e (which are not their chemical symbols): (i) Select the letter which represents a halogen. (ii) Select the letter which represents a noble gas. (iii) What type of bond is formed between a and b? (iv) What type of bond is formed between c and b? (v) Which element form a divalent anion? Give reasons for your choices.

Discussion

2732.	Which of the following is a colourless gas with a smell of rotten egg?
Answer» Which of the following is a colourless gas with a smell of rotten egg?

Discussion

2733.	23. Atom A,b,c,d occupy corners, FC, T void and O void. If body diagonal is removed the formula becomes
Answer» 23. Atom A,b,c,d occupy corners, FC, T void and O void. If body diagonal is removed the formula becomes

Discussion

2734.	The pressure exerted by a non-reactive gaseous mixture of 6.4 g of methane and 8.8 g of carbon dioxide in a 10 L vessel at 27oC is _____kPa. (Round off to the Nearest Integer). [Assume gases are ideal, R=8.314 J mol−1K−1.Atomic masses: C: 12.0 u, H : 1.0 u, O : 16.0 u]
Answer» The pressure exerted by a non-reactive gaseous mixture of $6.4 g$ of methane and $8.8 g$ of carbon dioxide in a $10 L$ vessel at $27^{o} C$ is _____kPa. (Round off to the Nearest Integer). [Assume gases are ideal, $R = 8.314 J m o l^{- 1} K^{- 1}$ . Atomic masses: C: 12.0 u, H : 1.0 u, O : 16.0 u]

Discussion

2735.	Why does bleaching powder form a milky solution in water?
Answer» Why does bleaching powder form a milky solution in water?

Discussion

2736.	Manganese dioxide gives _______ colour to the glass.
Answer» Manganese dioxide gives _______ colour to the glass.

Discussion

2737.	the number of atoms in 0.2mol of diatomic gas i
Answer» the number of atoms in 0.2mol of diatomic gas i

Discussion

2738.	Dry air was passed through bulbs containing a solution of 40 g of non-volatile electrolytic solute in 360 g of water, then through bulbs containing pure water at the same temperature and finally through a tube in which pumice moistened with strong H2SO4 was kept. The water bulbs lost 0.0870 g and the sulphuric acid tube gained 2.175 g. Calculate the molar mass of solute (in gram)
Answer» Dry air was passed through bulbs containing a solution of $40 g$ of non-volatile electrolytic solute in $360 g$ of water, then through bulbs containing pure water at the same temperature and finally through a tube in which pumice moistened with strong $H_{2} S O_{4}$ was kept. The water bulbs lost $0.0870 g$ and the sulphuric acid tube gained $2.175 g$ . Calculate the molar mass of solute (in gram)

Discussion

2739.	Question 47 A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal and its ore and give the reaction involved.
Answer» Question 47 A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal and its ore and give the reaction involved.

Discussion

2740.	1. Shortcut to remember periodic table.
Answer» 1. Shortcut to remember periodic table.

Discussion

2741.	Equimolar solutions of two weak acids HX and HY having pka values 4 and 6 are placed in contact with hydrogen electrode at 298K and 1atm and connected through a salt bridge. what is Ecell .
Answer» Equimolar solutions of two weak acids HX and HY having pka values 4 and 6 are placed in contact with hydrogen electrode at 298K and 1atm and connected through a salt bridge. what is Ecell .

Discussion

2742.	Name a non-metallic element which(a) forms acidic and neutral oxides(b) has a metallic lustre(c) is a liquid at ordinary temperatures(d) is a conductor of electricity
Answer» Name a non-metallic element which (a) forms acidic and neutral oxides (b) has a metallic lustre (c) is a liquid at ordinary temperatures (d) is a conductor of electricity

Discussion

2743.	96. How many half lives are required to complete 93.75% of a first order reaction C 6 D 8
Answer» 96. How many half lives are required to complete 93.75% of a first order reaction C 6 D 8

Discussion

2744.	Which of the following statements regarding thermoplastics and thermosets is/are true? Thermoplastics Thermosets A. Soft Hard B. Able to withstand heat Cannot withstand heat C. No cross-linkages Cross linkages present
Answer» Which of the following statements regarding thermoplastics and thermosets is/are true? Thermoplastics Thermosets A. Soft Hard B. Able to withstand heat Cannot withstand heat C. No cross-linkages Cross linkages present

2744.

Which of the following statements regarding thermoplastics and thermosets is/are true? Thermoplastics Thermosets A. Soft Hard B. Able to withstand heat Cannot withstand heat C. No cross-linkages Cross linkages present

Answer»

Which of the following statements regarding thermoplastics and thermosets is/are true?

Thermoplastics Thermosets

A. Soft Hard
B. Able to withstand heat Cannot withstand heat
C. No cross-linkages Cross linkages present

Discussion

2745.	When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place : (a) in the first case ? (b) in the second case ?
Answer» When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place : (a) in the first case ? (b) in the second case ?

2745.

When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place : (a) in the first case ? (b) in the second case ?

Answer»

When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place :

(a) in the first case ?

(b) in the second case ?

Discussion

2746.	Give them : (a) dot diagram of the first member of alcohol, (b) abbreviated formula of the third member of alcohol, (c) structure of the second member of the alcohol group. (d) structure of alcohol with 4 carbon atoms.
Answer» Give them : (a) dot diagram of the first member of alcohol, (b) abbreviated formula of the third member of alcohol, (c) structure of the second member of the alcohol group. (d) structure of alcohol with 4 carbon atoms.

Discussion

2747.	Choose the correct sequence for extraction of metal from its ore i) Concentration of ore.ii) Reduction of metallic oxidesiii) Conversion of the ore into its oxideiv) Refining of impure metal
Answer» Choose the correct sequence for extraction of metal from its ore i) Concentration of ore. ii) Reduction of metallic oxides iii) Conversion of the ore into its oxide iv) Refining of impure metal

Discussion

2748.	The question refer to the following salt solutions listed (1) to (6). Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
Answer» The question refer to the following salt solutions listed (1) to (6). Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?

2748.

The question refer to the following salt solutions listed (1) to (6). Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?

Answer»

The question refer to the following salt solutions listed (1) to (6).

Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?

Discussion

2749.	Define the acidity of a base. What is the acidity of ammonium hydroxide, magnesium hydroxide, and aluminium hydroxide?
Answer» Define the acidity of a base. What is the acidity of ammonium hydroxide, magnesium hydroxide, and aluminium hydroxide?

Discussion

2750.	45.How many electrons are delivered to the cathode during electrolysis by a current of 1 ampere for 193 seconds?
Answer» 45.How many electrons are delivered to the cathode during electrolysis by a current of 1 ampere for 193 seconds?

Discussion

Explore topic-wise InterviewSolutions in .

what is meant by tenselity

in a cons†an t volume calorimeter ,5g of a gas with molecular weight 40 was burnt in excess of oxygen at 298K.temp. of calorimeter rise from 298k to 298.75 K due to combustion process.given that heat capacity is 2.5kj/K. △ U of combustion of gas in KJ/mol is

Where is HCl used in the textile industry?

Name an alloy of: (a) aluminium used in aircraft construction. (b) lead used in electrical wiring or electrical work in joining metals. (c) copper in electrical appliances or household vessels. (d) zinc used in simple voltaic cells.

Why iron pyrites is not considered an ore?

What is known as the energy required to start a chemical reaction?

What is photo decomposition reaction

The number of moles present in 155 g of phosphorous is

If pressure becomes double at the same absolute temperature on 2 L of CO2 , then what will be the final volume of CO2?

What are biotic and abiotic factors?

Write the equations for the reactions, which take place at the electrodes during the electrolysis of lead bromide.

87.The structure of XeF4 is square planer it could be bent as Co2 as in both cases there are 2 pairs of lone pair electron there was a possibility of lone pair electronto be in the same side in XeF4 Explain according to law of hybridization

How many electrons are lost by zinc during the process of oxidation?

23. is doubledisplacement reaction reversible? And do the electronegative radicals have reactiviy series.

Give one example of an oxidation-reduction reaction which is also : (a) a combination reaction (b) a displacement reaction

why interstitial compounds have high melting point than those of pure metals ?

Calculate pH of 0.01M solutions of NaOH

58. The number of electrons in Na (Z=11) having ( n+l=3) (1) 1 (2) 4 (3) 7 (4)

Sulphuric acid acts as the ___ in lead accumulators.

Reaction of all metals with concentrated HNO3 gives NO2 +H2O + metal nitrate ?? Or there is some exceptions

Give one example of a substance which contains: (i) ions only, (ii) molecules only, (iii) both ions and molecules.

On the basis of Quantum numbers justify that sixth period of the periodic table should have 32 elements?

Explain the merits of modern periodic table?

the total no. of moles of CO2 formed on thermal decomposition of 4 moles of limesto

35. At 444 ^° C 15 mole of H2 and 5.2 mole of I2 react to form 10 mole of HI.calculate the equlibrium constant for the reaction

Which of the following molecule is called backminsterfullerene ? C90 C60 C70 C120

Explain briefly about representative elements ?

How abnormal molecular mass is observed in case of non-ideal or dilute solutions

What happens to hydronium ion concentration while diluting an acid

Which of the following is a colourless gas with a smell of rotten egg?

23. Atom A,b,c,d occupy corners, FC, T void and O void. If body diagonal is removed the formula becomes

The pressure exerted by a non-reactive gaseous mixture of 6.4 g of methane and 8.8 g of carbon dioxide in a 10 L vessel at 27oC is _____kPa. (Round off to the Nearest Integer). [Assume gases are ideal, R=8.314 J mol−1K−1.Atomic masses: C: 12.0 u, H : 1.0 u, O : 16.0 u]

Why does bleaching powder form a milky solution in water?

Manganese dioxide gives _______ colour to the glass.

the number of atoms in 0.2mol of diatomic gas i

Question 47 A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal and its ore and give the reaction involved.

1. Shortcut to remember periodic table.

Equimolar solutions of two weak acids HX and HY having pka values 4 and 6 are placed in contact with hydrogen electrode at 298K and 1atm and connected through a salt bridge. what is Ecell .

Name a non-metallic element which(a) forms acidic and neutral oxides(b) has a metallic lustre(c) is a liquid at ordinary temperatures(d) is a conductor of electricity

96. How many half lives are required to complete 93.75% of a first order reaction C 6 D 8

Which of the following statements regarding thermoplastics and thermosets is/are true? Thermoplastics Thermosets A. Soft Hard B. Able to withstand heat Cannot withstand heat C. No cross-linkages Cross linkages present

When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place : (a) in the first case ? (b) in the second case ?

Give them : (a) dot diagram of the first member of alcohol, (b) abbreviated formula of the third member of alcohol, (c) structure of the second member of the alcohol group. (d) structure of alcohol with 4 carbon atoms.

Choose the correct sequence for extraction of metal from its ore i) Concentration of ore.ii) Reduction of metallic oxidesiii) Conversion of the ore into its oxideiv) Refining of impure metal

The question refer to the following salt solutions listed (1) to (6). Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?

Define the acidity of a base. What is the acidity of ammonium hydroxide, magnesium hydroxide, and aluminium hydroxide?

45.How many electrons are delivered to the cathode during electrolysis by a current of 1 ampere for 193 seconds?